Whenever we talk about Mac clone makers such as Psystar, we all more or less accept as a fact that Apple is selling copies of its Mac OS X operating system at a price lower than it would have been if Apple did not have a hardware business. Even though we treat this statement as fact - recently, I've been wondering: where is the proof?

In fact, it is not at all clear that you incur no liability for violating the EULA, which the software requires you to accept in order to install it. The extent to which such "click to accept" contracts are binding is hardly settled law. In practice, of course, this is makes no difference to you individually, because even if you are liable, suing an end-user for violation of the EULA would be such bad public relations, that Apple almost certainly would never do it.